黄海的地壳速度结构与中朝-扬子块体拼合边界
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摘要
利用中国、韩国和 ISC 台站的地震走时数据反演了黄海地区的地壳 P 波速度结构,对比重力异常和断裂体系、Pn 波速度及其各向异性,分析了不同地球物理异常的相互关系以及黄海东部和西部的结构差异,为厘定黄海东部断裂暨中朝—扬子块体的拼合边界提供了新的信息.反演结果表明,北黄海和南黄海西部具有沉积盆地的地壳结构特征,P 波速度明显偏低且深度较大,说明盆地内部沉积层较厚、沉降幅度较大.以北黄海、南黄海海州湾和苏北—南黄盆地最为突出.南黄海中部、胶东半岛、辽东半岛和朝鲜半岛显示出构造隆起区的地壳速度特征,其中南黄海中部的高速异常具有北东方向的伸展痕迹,与胶东地区的区域构造走向趋于一致,但是与朝鲜半岛的高速异常并不相连,其间存在明显的分界.据此推测南黄海与朝鲜半岛之间可能存在一个近南北方向的深断裂——黄海东部断裂,至于该断裂是否可以作为中朝—扬子块体在海区的拼合边界,尚需获取黄海东部及朝鲜半岛更详细的相关资料提供依据.
P wave velocity structure in the crust of the Yellow Sea region was inverted by using P wave arrival data from the earthquakes recorded by Chinese,Korea and ISC stations.Taken together with gravity anomaly and fault system,Pn velocity and anisotropy,we analyzed the relation of various geophysical anomalies and the tectonic difference in the western and eastern Yellow Sea.This work provided further information for locating the eastern Yellow Sea fault zone and the collision boundary between the Sino-Korea and Yangtze blocks.The crust of the northern Yellow Sea and western South Yellow Sea shows a character of sedimentary basin,and their low P-wave velocities suggest thick deposits and large-scale depressions,particularly in the northern Yellow Sea,Haizhou Bay and southern South Yellow Sea basin.In contrast,the high velocity in the crust of the central South Yellow Sea,Jiaodong peninsula,Liaodong peninsula and Korea peninsula show a character of tectonically uplifted areas.The NE-oriented high-velocity anomalies in the central South Yellow Sea are correspondent to tectonic strikes in the Jiaodong peninsula,but they are not connected with those in Korea peninsula,obviously separated by a gap.We infer that there may be a NS-oriented deep fault zone (the eastern Yellow Sea fault zone) between the southern Yellow Sea and Korea peninsula,but still need more data from the eastern Yellow Sea and Korea peninsula to confirm its relation with the collision boundary between the Sino-Korea and Yangtze block.
P wave velocity structure in the crust of the Yellow Sea region was inverted by using P wave arrival data from the earthquakes recorded by Chinese,Korea and ISC stations.Taken together with gravity anomaly and fault system,Pn velocity and anisotropy,we analyzed the relation of various geophysical anomalies and the tectonic difference in the western and eastern Yellow Sea.This work provided further information for locating the eastern Yellow Sea fault zone and the collision boundary between the Sino-Korea and Yangtze blocks.The crust of the northern Yellow Sea and western South Yellow Sea shows a character of sedimentary basin,and their low P-wave velocities suggest thick deposits and large-scale depressions,particularly in the northern Yellow Sea,Haizhou Bay and southern South Yellow Sea basin.In contrast,the high velocity in the crust of the central South Yellow Sea,Jiaodong peninsula,Liaodong peninsula and Korea peninsula show a character of tectonically uplifted areas.The NE-oriented high-velocity anomalies in the central South Yellow Sea are correspondent to tectonic strikes in the Jiaodong peninsula,but they are not connected with those in Korea peninsula,obviously separated by a gap.We infer that there may be a NS-oriented deep fault zone (the eastern Yellow Sea fault zone) between the southern Yellow Sea and Korea peninsula,but still need more data from the eastern Yellow Sea and Korea peninsula to confirm its relation with the collision boundary between the Sino-Korea and Yangtze block.
引文
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[14] 胥颐,李志伟.刘劲松等.黄海及其邻近地区的Pn波速度与各向异性.地球物理学报,2008,51(5) :1444～1450 Xu Y.Li Z W.Liu J S,et al.,Pn wave velocity and anisotropy in the Yellow Sea and adjacent region.Chinese J.Geophys.(in Chinese),2008,51(5) :1444～1450
[15] Laske G,Masters G,Reif C.Crust 2． 0:a new global crustal model at 2×2 degrees.http://mahi.ucsd.edu/Gabi/rem.dir/crust2． html
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[17] Um J,Thurber C.A fast algorithm for two～point seismic ray tracing.Bull Seism.Soc.Am.,1987． 77:972～986
[18] Zhao D.Hasegawa A.Horiuchi S.Tomographic imaging of P and S wave velocity structure beneath northeastern Japan.J.Geophys.Res,.1992,97:19909～19928
[19] Zhao D,Hasegawa A,Kanamori H.Deep structure of Japan subduction zone as derived from local,regional and teleseismic events.J.Geophys.Res.,1994． 99(B11) :22313～22329
[20] Hearn T M.Anisotropic Pn tomography in the western United States.J.Geophys.Res.1996,101(B4) :8403～8414
[21] Ren J Y,Tamaki K,Li s,Zhang J X.Late Mesozoic and Cenozoic rifting and its dynamic setting in Eastern China and adjacent areas.Tectonophysics.2000,344:175～205
[22] Min K,cho M.Metamorphic evolution of the northwestern Ogcheon metamorphic belt,South Korea.Lithos,1998,43:31～51
[23] 万天丰.中朝与扬子板块的鉴别特征.地质评论,2000,47(1) :57～63 Wan T F.Distinctive characteristics of Sino-Korean and Yantze Plates.Geological Review(in Chinese),2000,47(1) :57～63
[24] Zhao X X,Coe R S,Chang K H,et al.Clockwise rotations recorded in Early Cretaceous rocks of South Korea:implications for tectonic affinity between the Korean Peninsula and North China.Geophys.J.Int.1999,139:447～463
[2] 蔡乾忠.中国东部与朝鲜大地构造单元对应划分.海洋地质与第四纪地质.1995,15(1) :7～24 Cai Q Z.Corresponding division of the geotectonic units of eastern China and Korea.Marine Geology ＆ Quaternary Geology(in Chinese).1995,15(1) :7～24
[3] 郭玉贵.王红霞.试论秦岭-大别山-胶南隆起-临津江褶皱带及其周缘地区的大地构造属性.海洋地质与第四纪地质,1995,15(2) :49～59 Guo Y G.Wang H X.Essay on the tectonics attribute of Qinling-Dabie mountain-Jiaonan uplift-Imjingang fold belt and adjacent regions.Marine Geology ＆ Quaternary Geology(in Chinese).1995,15(2) .49～59
[4] Ernst W G,Liou J G.Contrasting platetectonic styles of the Qinling-Dabie-Sulu and Franciscan metamorphic belts.Geology,1995,23:353～359
[5] Ree J H,Cho M,Kwon S T,et al.Possible eastward extension of Chinese collision belt in South Korea:The Imjingang belt.Geology,1996,24:1071～1075
[6] Chough S K,Kwon S T,Ree J H,Choi D K.Tectonic and sedimentary evolution of the Korean peninsula:a review and new view.Earth-Science Reviews,2000,52:175～235
[7] 张文佑.中国海区及邻域海陆大地构造.北京:科学出版社,1986 Zhang W Y.Marine and Continental Tectonics in China Seas and Adjacent Regions(in Chinese).Beijing:Science Press,1986
[8] Teraoka Y,Suzuki M,Kawakami K.Provenance of Cretaceous and Paleogene sediments in the Median Zone of Southwest Japan.Bulletin of the Geological Survey of Japan,1998． 49:395～411
[9] Ishiwatari A,Tsujimori T.Paleozoic ophiolites and blueschists in Japan and Russian Primorye in the tectonic framework of East Asia:A synthesis.The Island Arc,2003． 190～206
[10] Lee K S,Chang H W,Park K H.Neoproterozoic bimodal volcanism in the central Ogcheon belt,Korea:Age and tectonic implication.Precambrian Research,1998,89:47～57
[11] 郝天珧,Suh Mancheol,王谦身等.根据重力数据研究黄海周边断裂带在海区的延伸.地球物理学报,2002,45(3) :385～397 Hao T Y.Suh M,Wang Q S,et al.A study on the extension of fault zones in Yellow Sea and its adjacent areas based on gravity data.Chinese J.Geophys.(in Chinese),2002,45(3) :385～397
[12] 郝天珧,Suh Mancheol,刘建华等.黄海深部结构与中朝- 扬子块体结合带在海区位置的地球物理研究.地学前缘,2004,11(3) :51～61 Hao T Y,Suh M,Liu J H,et al.Deep structure and boundary belt position between Sino-Korean and Yangtze blocks in Yellow Sea.Earch Science Frontiers(in Chinese),2004,11(3) :51～61
[13] 胥颐,刘建华,郝天珧等.中国东部海域及邻区岩石层地幔的P波速度结构与构造分析.地球物理学报,2006,49(4) :1053～1061 Xu Y,Liu J H.Hao T Y,et al.P wave velocity structure and tectonics analysis of lithospheric mantle in eastern China seas and adjacent regions.Chinese J.Geophys.(in Chinese),2006,49(4) :1053～1061
[14] 胥颐,李志伟.刘劲松等.黄海及其邻近地区的Pn波速度与各向异性.地球物理学报,2008,51(5) :1444～1450 Xu Y.Li Z W.Liu J S,et al.,Pn wave velocity and anisotropy in the Yellow Sea and adjacent region.Chinese J.Geophys.(in Chinese),2008,51(5) :1444～1450
[15] Laske G,Masters G,Reif C.Crust 2． 0:a new global crustal model at 2×2 degrees.http://mahi.ucsd.edu/Gabi/rem.dir/crust2． html
[16] Kennett B L N,Engdahl E R.Travel times for global earthquake location and phase identification.Geopht.J.Int.,1991,105(2) :429～465
[17] Um J,Thurber C.A fast algorithm for two～point seismic ray tracing.Bull Seism.Soc.Am.,1987． 77:972～986
[18] Zhao D.Hasegawa A.Horiuchi S.Tomographic imaging of P and S wave velocity structure beneath northeastern Japan.J.Geophys.Res,.1992,97:19909～19928
[19] Zhao D,Hasegawa A,Kanamori H.Deep structure of Japan subduction zone as derived from local,regional and teleseismic events.J.Geophys.Res.,1994． 99(B11) :22313～22329
[20] Hearn T M.Anisotropic Pn tomography in the western United States.J.Geophys.Res.1996,101(B4) :8403～8414
[21] Ren J Y,Tamaki K,Li s,Zhang J X.Late Mesozoic and Cenozoic rifting and its dynamic setting in Eastern China and adjacent areas.Tectonophysics.2000,344:175～205
[22] Min K,cho M.Metamorphic evolution of the northwestern Ogcheon metamorphic belt,South Korea.Lithos,1998,43:31～51
[23] 万天丰.中朝与扬子板块的鉴别特征.地质评论,2000,47(1) :57～63 Wan T F.Distinctive characteristics of Sino-Korean and Yantze Plates.Geological Review(in Chinese),2000,47(1) :57～63
[24] Zhao X X,Coe R S,Chang K H,et al.Clockwise rotations recorded in Early Cretaceous rocks of South Korea:implications for tectonic affinity between the Korean Peninsula and North China.Geophys.J.Int.1999,139:447～463
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